Railway-car-bolster arrangement



L A. LAMONT.

RAILWAY CAR BOLSTER ARRANGEMENT.

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RAILWAY CAR BOLSTER ARRANGEMENT.

I. APPLICATION FILED SEPT. UL 1920. 1,371 Patented May 10 1921.

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I. A. LAMONT. RAILWAY CAR BOLSTER ARRANGEMENT.

APPLICATION FILED SEPT. 20, I920- ted ay 1%, 1921 4 SHEEISSHEET SI W WW W J. A. LAMONT.

RAILWAY CAR BOLSTER ARRANGEMENT.

APPLICATION FILED SEPT. 20. I920.

Patented May W, 1921.

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JOHN A. LAMONT, OF CHICAGO, ILLINOIS, ASSIGNOR TO AMERICAN STEEL FOUNDRIES,

OF CHICAGO, ILLINOIS, A CORPORATION OF NEW JERSEY.

RAIL'i/VAY-CAR-BOLSTER ARRANGEMENT.

Specification of Letters Patent.

Patented Biliary it), 19121.

Application filed September 20, 1920. Serial No. 411,692.

To all whom it may concern: 4

Be it known that I, JOHN'A. LAMONT, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Railway-Car-Bolster Arrangements, of which the following is a specification.

This invention relates to railway car bolster arrangements.

One object of the invention is to provide a simple and efficient truck bolster which is particularly adapted for use in accommodating itself to the associated car frame and truck side frames, especially over vertically and horizontally curved tracks.-

Another object is to provide a bolster which cooperates with the truck side frames in a manner to reduce the wheel base.

These and other objects are accomplished by means of the arrangement disclosed on the accompanying sheets of drawings, in which- Figure 1 is a top plan view of a truck bolster embodying my invention;

' Fig. 2 is an end elevation of the same;

Fig. 3 is a sectional view taken in the plane of line 3-3 of Fig. 1;

Fig. 4 is a front elevation of the same bolster;

Fig. 5 is a sectional view taken in the plane of line 55 of Fig. 1;

Fig. 6 is a partial sectional view taken in the plane of line 6-6 of Fig. 1;

Fig. 7 is a sectional view taken in the plane of line 7-7 of Fig. 1;

Fig. 8 is a fragmentary bottom plan view of one arm of the bolster; and,

Fig. 9 is a fragmentary side elevation of a railway car truck showing particularly the cooperation between the truck side frame composed of two hinged parts, bolster pivot bearing and holster eccentric bearing.

journals as is practical.

beam 14:. The transverse arms ll and 12 connect the beams 13 and 14 with the main body portion 10;, the latter of which has the usual centerplate l9.-

ihe two main points of this invention are to providea car. bolster to cooperate with the hinged side frames in a manner to shorten the wheel base and to provide an arrangement whereby there may be free relative movements between the bolster and side frames and the car frame, especially whereverticaland-horizontal curves are encountered in the tracks.

" In this connection the arms 15, 16, 17 and 18 of the truck bolster. are placed as close to the center lines of theextreme or end To arrange the bearing surfaces of these bolster arms 15, 16, 17 and 18 as close as possible to the center lines of the journals, 1 have provided I each of said arms with an eccentric bearing portion 20, which is curved to permit a rocking motion with respect to the bearing means on the associated side frames. Preferably the bearing surface 20 may engage a bearing cap 21 having a stem 22 pivotally mounted about a vertical axis in an associated side frame 23, as shown in Figs. 6 and 9 of the drawings. In this way the bolster armsinay pivot about a vertical axis. being of value in rounding a horizontal curve, as well as roll relatively to the side frames on the bearing surfaces 20 when vertical curves are encountered, such, for example, as are foundin switch-backs, the vertical curvature of which ranges from 2 to 7. This means that there results a considerable angularity of frame and bolster relative to the car body. as well as to each other. Also by having the bearing members 20 eccentric with respect to the longitudinal centersof the arms and as close to the journal bearings as possible. the wheel base is materially shortened. The eccentrically arranged bearing portions 20 are provided on either side with flanges 2st and 25 for maintaining the relative lateral position of the bolster with respect to the side frame, it being understood that the flanges 24 and 25 embrace opposite sides of the pivotal bearing member 21, which, as mentioned, in each case is pivotally mounted in the associated side frame. It will be appreciated, of course, that the radius of curvature of the bearing surface of the bearing caps 21 is greater than the radius of curvature of the bearing surface 20 to permit rolling of the bearing. surfaces 20 uponsaid caps. Preferably the outer ends of the concentrically arranged bearing portions 20 terminate in line with the outer end surfaces of the associated bolster arms, as best shown in Fig; 2.

It is my intention to cover all modifications of the invention falling within the spirit and scope of the following claims.

' I claim:

1. A railway car truck including a hinged side frame and a bolster having a plurality of arms with curved bearing surfaces adapted to rock on a cooperating bearing surface to prevent distortion of parts when vertical track curves are encountered.

2. A railway car truck including a hinged side frame and a bolster having a body portion and four arms, each having a rocking surface adapted to cooperate with a bearing surface to prevent distortion of parts when vertical track curves are encountered.

3. A railway car bolster having ends with eccentrically arranged bearing surfaces to cooperate with an associated side frame to shorten the wheel base.

4. A railway car bolster'having arms with bearing surfaces arranged eccentrically with respect to the center lines of said arms to cooperate with the associated side frame to shorten the wheel base.

5. A railway car truckincluding a hinged side frame and a bolster having ends with curved bearing surfaces to permit a rocking action and having flanges to limit movement of the bolster ina given direction.

6. A railway car bolster having ends with eccentrically arranged rocking bearing surfaces to cooperate with an associated side frame to shorten the wheel base and having flangesarra-nged adjacent the bearing surfaces to limit movement of the bolster in a given direction.

Signed at Chicago, Illinois, this 10th day of September, 1920.

1 JOHN A. LAMONT. 

